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Recently, it has been found that there is a constant difference between the results of the particle size distribution measured with the sieve method and the optical microscope image processing method. The causes for this are due to the particles being destroyed with the sieve and the dependence on the varied shape of the particles and how they flow through the mesh of the sieve. In this paper, the relation between the mesh size and the shape of the particle is modelled and the formula which expresses the relation between the equivalent mesh diameter Dm of the sieve and the equivalent volume diameter Dp is established. The propriety of this model is shown by the experimental results.

Comparative Calibration Method on the Measurement of Particle Sizes in Pulverized Coal